1RMH

RECOMBINANT CYCLOPHILIN A FROM HUMAN T CELL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure implies that cyclophilin predominantly catalyzes the trans to cis isomerization.

Zhao, Y.Ke, H.

(1996) Biochemistry 35: 7356-7361

  • DOI: 10.1021/bi9602775
  • Primary Citation of Related Structures:  
    1RMH

  • PubMed Abstract: 
  • The crystal structure of human recombinant cyclophilin A complexed with a substrate of succinyl-Ala-Ala-Pro-Phe-p-nitroanilide (AAPF) has been determined and refined to an R-factor of 0.189 at 2.4 A resolution. The structure revealed only the cis for ...

    The crystal structure of human recombinant cyclophilin A complexed with a substrate of succinyl-Ala-Ala-Pro-Phe-p-nitroanilide (AAPF) has been determined and refined to an R-factor of 0.189 at 2.4 A resolution. The structure revealed only the cis form of the substrate bound to cyclophilin A in a stoichiometry of 1:1. This binding ratio is different from the structure of cyclophilin A complexed with the tetrapeptide N-acetyl-Ala-Ala-Pro-Ala-amidomethylcourmarin. Model docking revealed that the trans form of AAPF does not fit into the active site. The observation that only the trans cis form of AAPF binds to cyclophilin A implies that cyclophilin A predominantly catalyzes the trans to cis isomerization of a peptidylprolyl amide bond. On the basis of the structure, it is proposed that Arg55 hydrogen-bonds to the nitrogen to deconjugate the resonance of the prolyl amide bond and thus facilitates the cis-trans rotation.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, School of Medicine, University of North Carolina, Chapel Hill 27599, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLOPHILIN AA, B164Homo sapiensMutation(s): 0 
Gene Names: CYCLOPHILINPPIACYPA
EC: 5.2.1.8
Find proteins for P62937 (Homo sapiens)
Explore P62937 
Go to UniProtKB:  P62937
NIH Common Fund Data Resources
PHAROS  P62937
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AAPF PEPTIDE SUBSTRATEC, D6N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.8α = 90
b = 109.2β = 90
c = 118.7γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 1995-07-31 
  • Released Date: 1996-10-14 
  • Deposition Author(s): Zhao, Y., Ke, H.

Revision History 

  • Version 1.0: 1996-10-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other